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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* |
3 | * drivers/cpufreq/cpufreq_ondemand.c | |
4 | * | |
5 | * Copyright (C) 2001 Russell King | |
6 | * (C) 2003 Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>. | |
7 | * Jun Nakajima <jun.nakajima@intel.com> | |
1da177e4 LT |
8 | */ |
9 | ||
4471a34f VK |
10 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
11 | ||
5ff0a268 | 12 | #include <linux/cpu.h> |
4471a34f | 13 | #include <linux/percpu-defs.h> |
4d5dcc42 | 14 | #include <linux/slab.h> |
80800913 | 15 | #include <linux/tick.h> |
55687da1 | 16 | #include <linux/sched/cpufreq.h> |
7d5a9956 RW |
17 | |
18 | #include "cpufreq_ondemand.h" | |
1da177e4 | 19 | |
06eb09d1 | 20 | /* On-demand governor macros */ |
1da177e4 | 21 | #define DEF_FREQUENCY_UP_THRESHOLD (80) |
3f78a9f7 DN |
22 | #define DEF_SAMPLING_DOWN_FACTOR (1) |
23 | #define MAX_SAMPLING_DOWN_FACTOR (100000) | |
80800913 | 24 | #define MICRO_FREQUENCY_UP_THRESHOLD (95) |
cef9615a | 25 | #define MICRO_FREQUENCY_MIN_SAMPLE_RATE (10000) |
4dd63b49 | 26 | #define MIN_FREQUENCY_UP_THRESHOLD (1) |
1da177e4 LT |
27 | #define MAX_FREQUENCY_UP_THRESHOLD (100) |
28 | ||
fb30809e JS |
29 | static struct od_ops od_ops; |
30 | ||
c2837558 JS |
31 | static unsigned int default_powersave_bias; |
32 | ||
4471a34f VK |
33 | /* |
34 | * Not all CPUs want IO time to be accounted as busy; this depends on how | |
35 | * efficient idling at a higher frequency/voltage is. | |
36 | * Pavel Machek says this is not so for various generations of AMD and old | |
37 | * Intel systems. | |
06eb09d1 | 38 | * Mike Chan (android.com) claims this is also not true for ARM. |
4471a34f VK |
39 | * Because of this, whitelist specific known (series) of CPUs by default, and |
40 | * leave all others up to the user. | |
41 | */ | |
42 | static int should_io_be_busy(void) | |
43 | { | |
44 | #if defined(CONFIG_X86) | |
45 | /* | |
06eb09d1 | 46 | * For Intel, Core 2 (model 15) and later have an efficient idle. |
4471a34f VK |
47 | */ |
48 | if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL && | |
49 | boot_cpu_data.x86 == 6 && | |
50 | boot_cpu_data.x86_model >= 15) | |
51 | return 1; | |
52 | #endif | |
53 | return 0; | |
6b8fcd90 AV |
54 | } |
55 | ||
05ca0350 AS |
56 | /* |
57 | * Find right freq to be set now with powersave_bias on. | |
07aa4402 RW |
58 | * Returns the freq_hi to be used right now and will set freq_hi_delay_us, |
59 | * freq_lo, and freq_lo_delay_us in percpu area for averaging freqs. | |
05ca0350 | 60 | */ |
fb30809e | 61 | static unsigned int generic_powersave_bias_target(struct cpufreq_policy *policy, |
4471a34f | 62 | unsigned int freq_next, unsigned int relation) |
05ca0350 AS |
63 | { |
64 | unsigned int freq_req, freq_reduc, freq_avg; | |
65 | unsigned int freq_hi, freq_lo; | |
d218ed77 | 66 | unsigned int index; |
07aa4402 | 67 | unsigned int delay_hi_us; |
bc505475 | 68 | struct policy_dbs_info *policy_dbs = policy->governor_data; |
7d5a9956 | 69 | struct od_policy_dbs_info *dbs_info = to_dbs_info(policy_dbs); |
bc505475 | 70 | struct dbs_data *dbs_data = policy_dbs->dbs_data; |
4d5dcc42 | 71 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; |
34ac5d7a | 72 | struct cpufreq_frequency_table *freq_table = policy->freq_table; |
05ca0350 | 73 | |
34ac5d7a | 74 | if (!freq_table) { |
05ca0350 | 75 | dbs_info->freq_lo = 0; |
07aa4402 | 76 | dbs_info->freq_lo_delay_us = 0; |
05ca0350 AS |
77 | return freq_next; |
78 | } | |
79 | ||
d218ed77 | 80 | index = cpufreq_frequency_table_target(policy, freq_next, relation); |
34ac5d7a | 81 | freq_req = freq_table[index].frequency; |
4d5dcc42 | 82 | freq_reduc = freq_req * od_tuners->powersave_bias / 1000; |
05ca0350 AS |
83 | freq_avg = freq_req - freq_reduc; |
84 | ||
85 | /* Find freq bounds for freq_avg in freq_table */ | |
82577360 | 86 | index = cpufreq_table_find_index_h(policy, freq_avg); |
34ac5d7a | 87 | freq_lo = freq_table[index].frequency; |
82577360 | 88 | index = cpufreq_table_find_index_l(policy, freq_avg); |
34ac5d7a | 89 | freq_hi = freq_table[index].frequency; |
05ca0350 AS |
90 | |
91 | /* Find out how long we have to be in hi and lo freqs */ | |
92 | if (freq_hi == freq_lo) { | |
93 | dbs_info->freq_lo = 0; | |
07aa4402 | 94 | dbs_info->freq_lo_delay_us = 0; |
05ca0350 AS |
95 | return freq_lo; |
96 | } | |
07aa4402 RW |
97 | delay_hi_us = (freq_avg - freq_lo) * dbs_data->sampling_rate; |
98 | delay_hi_us += (freq_hi - freq_lo) / 2; | |
99 | delay_hi_us /= freq_hi - freq_lo; | |
100 | dbs_info->freq_hi_delay_us = delay_hi_us; | |
05ca0350 | 101 | dbs_info->freq_lo = freq_lo; |
07aa4402 | 102 | dbs_info->freq_lo_delay_us = dbs_data->sampling_rate - delay_hi_us; |
05ca0350 AS |
103 | return freq_hi; |
104 | } | |
105 | ||
d1db75ff | 106 | static void ondemand_powersave_bias_init(struct cpufreq_policy *policy) |
05ca0350 | 107 | { |
7d5a9956 | 108 | struct od_policy_dbs_info *dbs_info = to_dbs_info(policy->governor_data); |
d1db75ff | 109 | |
d1db75ff | 110 | dbs_info->freq_lo = 0; |
05ca0350 AS |
111 | } |
112 | ||
3a3e9e06 | 113 | static void dbs_freq_increase(struct cpufreq_policy *policy, unsigned int freq) |
4471a34f | 114 | { |
bc505475 RW |
115 | struct policy_dbs_info *policy_dbs = policy->governor_data; |
116 | struct dbs_data *dbs_data = policy_dbs->dbs_data; | |
4d5dcc42 VK |
117 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; |
118 | ||
119 | if (od_tuners->powersave_bias) | |
3a3e9e06 | 120 | freq = od_ops.powersave_bias_target(policy, freq, |
fb30809e | 121 | CPUFREQ_RELATION_H); |
3a3e9e06 | 122 | else if (policy->cur == policy->max) |
4471a34f | 123 | return; |
0e625ac1 | 124 | |
3a3e9e06 | 125 | __cpufreq_driver_target(policy, freq, od_tuners->powersave_bias ? |
4471a34f VK |
126 | CPUFREQ_RELATION_L : CPUFREQ_RELATION_H); |
127 | } | |
128 | ||
129 | /* | |
130 | * Every sampling_rate, we check, if current idle time is less than 20% | |
dfa5bb62 SK |
131 | * (default), then we try to increase frequency. Else, we adjust the frequency |
132 | * proportional to load. | |
4471a34f | 133 | */ |
4cccf755 | 134 | static void od_update(struct cpufreq_policy *policy) |
1da177e4 | 135 | { |
7d5a9956 RW |
136 | struct policy_dbs_info *policy_dbs = policy->governor_data; |
137 | struct od_policy_dbs_info *dbs_info = to_dbs_info(policy_dbs); | |
bc505475 | 138 | struct dbs_data *dbs_data = policy_dbs->dbs_data; |
4d5dcc42 | 139 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; |
4cccf755 | 140 | unsigned int load = dbs_update(policy); |
4471a34f VK |
141 | |
142 | dbs_info->freq_lo = 0; | |
143 | ||
144 | /* Check for frequency increase */ | |
ff4b1789 | 145 | if (load > dbs_data->up_threshold) { |
4471a34f VK |
146 | /* If switching to max speed, apply sampling_down_factor */ |
147 | if (policy->cur < policy->max) | |
57dc3bcd | 148 | policy_dbs->rate_mult = dbs_data->sampling_down_factor; |
4471a34f | 149 | dbs_freq_increase(policy, policy->max); |
dfa5bb62 SK |
150 | } else { |
151 | /* Calculate the next frequency proportional to load */ | |
6393d6a1 SK |
152 | unsigned int freq_next, min_f, max_f; |
153 | ||
154 | min_f = policy->cpuinfo.min_freq; | |
155 | max_f = policy->cpuinfo.max_freq; | |
156 | freq_next = min_f + load * (max_f - min_f) / 100; | |
4471a34f VK |
157 | |
158 | /* No longer fully busy, reset rate_mult */ | |
57dc3bcd | 159 | policy_dbs->rate_mult = 1; |
4471a34f | 160 | |
a7f35cff RW |
161 | if (od_tuners->powersave_bias) |
162 | freq_next = od_ops.powersave_bias_target(policy, | |
163 | freq_next, | |
164 | CPUFREQ_RELATION_L); | |
165 | ||
6393d6a1 | 166 | __cpufreq_driver_target(policy, freq_next, CPUFREQ_RELATION_C); |
4471a34f | 167 | } |
1da177e4 LT |
168 | } |
169 | ||
26f0dbc9 | 170 | static unsigned int od_dbs_update(struct cpufreq_policy *policy) |
4471a34f | 171 | { |
bc505475 RW |
172 | struct policy_dbs_info *policy_dbs = policy->governor_data; |
173 | struct dbs_data *dbs_data = policy_dbs->dbs_data; | |
7d5a9956 | 174 | struct od_policy_dbs_info *dbs_info = to_dbs_info(policy_dbs); |
6e96c5b3 | 175 | int sample_type = dbs_info->sample_type; |
4447266b | 176 | |
4471a34f | 177 | /* Common NORMAL_SAMPLE setup */ |
43e0ee36 | 178 | dbs_info->sample_type = OD_NORMAL_SAMPLE; |
4cccf755 RW |
179 | /* |
180 | * OD_SUB_SAMPLE doesn't make sense if sample_delay_ns is 0, so ignore | |
181 | * it then. | |
182 | */ | |
183 | if (sample_type == OD_SUB_SAMPLE && policy_dbs->sample_delay_ns > 0) { | |
43e0ee36 | 184 | __cpufreq_driver_target(policy, dbs_info->freq_lo, |
42994af6 | 185 | CPUFREQ_RELATION_H); |
07aa4402 | 186 | return dbs_info->freq_lo_delay_us; |
6e96c5b3 RW |
187 | } |
188 | ||
189 | od_update(policy); | |
190 | ||
191 | if (dbs_info->freq_lo) { | |
26f0dbc9 | 192 | /* Setup SUB_SAMPLE */ |
6e96c5b3 | 193 | dbs_info->sample_type = OD_SUB_SAMPLE; |
07aa4402 | 194 | return dbs_info->freq_hi_delay_us; |
4471a34f VK |
195 | } |
196 | ||
07aa4402 | 197 | return dbs_data->sampling_rate * policy_dbs->rate_mult; |
da53d61e FB |
198 | } |
199 | ||
4471a34f | 200 | /************************** sysfs interface ************************/ |
7bdad34d | 201 | static struct dbs_governor od_dbs_gov; |
1da177e4 | 202 | |
0dd3c1d6 RW |
203 | static ssize_t store_io_is_busy(struct gov_attr_set *attr_set, const char *buf, |
204 | size_t count) | |
19379b11 | 205 | { |
0dd3c1d6 | 206 | struct dbs_data *dbs_data = to_dbs_data(attr_set); |
19379b11 AV |
207 | unsigned int input; |
208 | int ret; | |
209 | ||
210 | ret = sscanf(buf, "%u", &input); | |
211 | if (ret != 1) | |
212 | return -EINVAL; | |
8847e038 | 213 | dbs_data->io_is_busy = !!input; |
9366d840 SK |
214 | |
215 | /* we need to re-evaluate prev_cpu_idle */ | |
8c8f77fd | 216 | gov_update_cpu_data(dbs_data); |
a33cce1c | 217 | |
19379b11 AV |
218 | return count; |
219 | } | |
220 | ||
0dd3c1d6 RW |
221 | static ssize_t store_up_threshold(struct gov_attr_set *attr_set, |
222 | const char *buf, size_t count) | |
1da177e4 | 223 | { |
0dd3c1d6 | 224 | struct dbs_data *dbs_data = to_dbs_data(attr_set); |
1da177e4 LT |
225 | unsigned int input; |
226 | int ret; | |
ffac80e9 | 227 | ret = sscanf(buf, "%u", &input); |
1da177e4 | 228 | |
32ee8c3e | 229 | if (ret != 1 || input > MAX_FREQUENCY_UP_THRESHOLD || |
c29f1403 | 230 | input < MIN_FREQUENCY_UP_THRESHOLD) { |
1da177e4 LT |
231 | return -EINVAL; |
232 | } | |
4bd4e428 | 233 | |
ff4b1789 | 234 | dbs_data->up_threshold = input; |
1da177e4 LT |
235 | return count; |
236 | } | |
237 | ||
0dd3c1d6 RW |
238 | static ssize_t store_sampling_down_factor(struct gov_attr_set *attr_set, |
239 | const char *buf, size_t count) | |
3f78a9f7 | 240 | { |
0dd3c1d6 | 241 | struct dbs_data *dbs_data = to_dbs_data(attr_set); |
57dc3bcd RW |
242 | struct policy_dbs_info *policy_dbs; |
243 | unsigned int input; | |
3f78a9f7 DN |
244 | int ret; |
245 | ret = sscanf(buf, "%u", &input); | |
246 | ||
247 | if (ret != 1 || input > MAX_SAMPLING_DOWN_FACTOR || input < 1) | |
248 | return -EINVAL; | |
57dc3bcd | 249 | |
ff4b1789 | 250 | dbs_data->sampling_down_factor = input; |
3f78a9f7 DN |
251 | |
252 | /* Reset down sampling multiplier in case it was active */ | |
0dd3c1d6 | 253 | list_for_each_entry(policy_dbs, &attr_set->policy_list, list) { |
57dc3bcd RW |
254 | /* |
255 | * Doing this without locking might lead to using different | |
26f0dbc9 | 256 | * rate_mult values in od_update() and od_dbs_update(). |
57dc3bcd | 257 | */ |
26f0dbc9 | 258 | mutex_lock(&policy_dbs->update_mutex); |
57dc3bcd | 259 | policy_dbs->rate_mult = 1; |
26f0dbc9 | 260 | mutex_unlock(&policy_dbs->update_mutex); |
3f78a9f7 | 261 | } |
57dc3bcd | 262 | |
3f78a9f7 DN |
263 | return count; |
264 | } | |
265 | ||
0dd3c1d6 RW |
266 | static ssize_t store_ignore_nice_load(struct gov_attr_set *attr_set, |
267 | const char *buf, size_t count) | |
3d5ee9e5 | 268 | { |
0dd3c1d6 | 269 | struct dbs_data *dbs_data = to_dbs_data(attr_set); |
3d5ee9e5 DJ |
270 | unsigned int input; |
271 | int ret; | |
272 | ||
ffac80e9 | 273 | ret = sscanf(buf, "%u", &input); |
2b03f891 | 274 | if (ret != 1) |
3d5ee9e5 DJ |
275 | return -EINVAL; |
276 | ||
2b03f891 | 277 | if (input > 1) |
3d5ee9e5 | 278 | input = 1; |
32ee8c3e | 279 | |
ff4b1789 | 280 | if (input == dbs_data->ignore_nice_load) { /* nothing to do */ |
3d5ee9e5 DJ |
281 | return count; |
282 | } | |
ff4b1789 | 283 | dbs_data->ignore_nice_load = input; |
3d5ee9e5 | 284 | |
ccb2fe20 | 285 | /* we need to re-evaluate prev_cpu_idle */ |
8c8f77fd | 286 | gov_update_cpu_data(dbs_data); |
1ca3abdb | 287 | |
3d5ee9e5 DJ |
288 | return count; |
289 | } | |
290 | ||
0dd3c1d6 RW |
291 | static ssize_t store_powersave_bias(struct gov_attr_set *attr_set, |
292 | const char *buf, size_t count) | |
05ca0350 | 293 | { |
0dd3c1d6 | 294 | struct dbs_data *dbs_data = to_dbs_data(attr_set); |
4d5dcc42 | 295 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; |
d1db75ff | 296 | struct policy_dbs_info *policy_dbs; |
05ca0350 AS |
297 | unsigned int input; |
298 | int ret; | |
299 | ret = sscanf(buf, "%u", &input); | |
300 | ||
301 | if (ret != 1) | |
302 | return -EINVAL; | |
303 | ||
304 | if (input > 1000) | |
305 | input = 1000; | |
306 | ||
4d5dcc42 | 307 | od_tuners->powersave_bias = input; |
d1db75ff | 308 | |
0dd3c1d6 | 309 | list_for_each_entry(policy_dbs, &attr_set->policy_list, list) |
d1db75ff RW |
310 | ondemand_powersave_bias_init(policy_dbs->policy); |
311 | ||
05ca0350 AS |
312 | return count; |
313 | } | |
314 | ||
c4435630 VK |
315 | gov_show_one_common(sampling_rate); |
316 | gov_show_one_common(up_threshold); | |
317 | gov_show_one_common(sampling_down_factor); | |
318 | gov_show_one_common(ignore_nice_load); | |
8847e038 | 319 | gov_show_one_common(io_is_busy); |
c4435630 VK |
320 | gov_show_one(od, powersave_bias); |
321 | ||
322 | gov_attr_rw(sampling_rate); | |
323 | gov_attr_rw(io_is_busy); | |
324 | gov_attr_rw(up_threshold); | |
325 | gov_attr_rw(sampling_down_factor); | |
326 | gov_attr_rw(ignore_nice_load); | |
327 | gov_attr_rw(powersave_bias); | |
c4435630 VK |
328 | |
329 | static struct attribute *od_attributes[] = { | |
c4435630 VK |
330 | &sampling_rate.attr, |
331 | &up_threshold.attr, | |
332 | &sampling_down_factor.attr, | |
333 | &ignore_nice_load.attr, | |
334 | &powersave_bias.attr, | |
335 | &io_is_busy.attr, | |
1da177e4 LT |
336 | NULL |
337 | }; | |
338 | ||
1da177e4 LT |
339 | /************************** sysfs end ************************/ |
340 | ||
7d5a9956 RW |
341 | static struct policy_dbs_info *od_alloc(void) |
342 | { | |
343 | struct od_policy_dbs_info *dbs_info; | |
344 | ||
345 | dbs_info = kzalloc(sizeof(*dbs_info), GFP_KERNEL); | |
346 | return dbs_info ? &dbs_info->policy_dbs : NULL; | |
347 | } | |
348 | ||
349 | static void od_free(struct policy_dbs_info *policy_dbs) | |
350 | { | |
351 | kfree(to_dbs_info(policy_dbs)); | |
352 | } | |
353 | ||
9a15fb2c | 354 | static int od_init(struct dbs_data *dbs_data) |
4d5dcc42 VK |
355 | { |
356 | struct od_dbs_tuners *tuners; | |
357 | u64 idle_time; | |
358 | int cpu; | |
359 | ||
d5b73cd8 | 360 | tuners = kzalloc(sizeof(*tuners), GFP_KERNEL); |
a69d6b29 | 361 | if (!tuners) |
4d5dcc42 | 362 | return -ENOMEM; |
4d5dcc42 VK |
363 | |
364 | cpu = get_cpu(); | |
365 | idle_time = get_cpu_idle_time_us(cpu, NULL); | |
366 | put_cpu(); | |
367 | if (idle_time != -1ULL) { | |
368 | /* Idle micro accounting is supported. Use finer thresholds */ | |
ff4b1789 | 369 | dbs_data->up_threshold = MICRO_FREQUENCY_UP_THRESHOLD; |
4d5dcc42 | 370 | } else { |
ff4b1789 | 371 | dbs_data->up_threshold = DEF_FREQUENCY_UP_THRESHOLD; |
4d5dcc42 VK |
372 | } |
373 | ||
ff4b1789 VK |
374 | dbs_data->sampling_down_factor = DEF_SAMPLING_DOWN_FACTOR; |
375 | dbs_data->ignore_nice_load = 0; | |
c2837558 | 376 | tuners->powersave_bias = default_powersave_bias; |
8847e038 | 377 | dbs_data->io_is_busy = should_io_be_busy(); |
4d5dcc42 VK |
378 | |
379 | dbs_data->tuners = tuners; | |
4d5dcc42 VK |
380 | return 0; |
381 | } | |
382 | ||
9a15fb2c | 383 | static void od_exit(struct dbs_data *dbs_data) |
4d5dcc42 VK |
384 | { |
385 | kfree(dbs_data->tuners); | |
386 | } | |
387 | ||
702c9e54 RW |
388 | static void od_start(struct cpufreq_policy *policy) |
389 | { | |
7d5a9956 | 390 | struct od_policy_dbs_info *dbs_info = to_dbs_info(policy->governor_data); |
702c9e54 RW |
391 | |
392 | dbs_info->sample_type = OD_NORMAL_SAMPLE; | |
d1db75ff | 393 | ondemand_powersave_bias_init(policy); |
702c9e54 RW |
394 | } |
395 | ||
4471a34f | 396 | static struct od_ops od_ops = { |
fb30809e | 397 | .powersave_bias_target = generic_powersave_bias_target, |
4471a34f | 398 | }; |
2f8a835c | 399 | |
7bdad34d | 400 | static struct dbs_governor od_dbs_gov = { |
e788892b | 401 | .gov = CPUFREQ_DBS_GOVERNOR_INITIALIZER("ondemand"), |
c4435630 | 402 | .kobj_type = { .default_attrs = od_attributes }, |
26f0dbc9 | 403 | .gov_dbs_update = od_dbs_update, |
7d5a9956 RW |
404 | .alloc = od_alloc, |
405 | .free = od_free, | |
4d5dcc42 VK |
406 | .init = od_init, |
407 | .exit = od_exit, | |
702c9e54 | 408 | .start = od_start, |
4471a34f | 409 | }; |
1da177e4 | 410 | |
10dd8573 | 411 | #define CPU_FREQ_GOV_ONDEMAND (od_dbs_gov.gov) |
af926185 | 412 | |
fb30809e JS |
413 | static void od_set_powersave_bias(unsigned int powersave_bias) |
414 | { | |
fb30809e JS |
415 | unsigned int cpu; |
416 | cpumask_t done; | |
417 | ||
c2837558 | 418 | default_powersave_bias = powersave_bias; |
fb30809e JS |
419 | cpumask_clear(&done); |
420 | ||
09681a07 | 421 | cpus_read_lock(); |
fb30809e | 422 | for_each_online_cpu(cpu) { |
8c8f77fd | 423 | struct cpufreq_policy *policy; |
e40e7b25 | 424 | struct policy_dbs_info *policy_dbs; |
8c8f77fd RW |
425 | struct dbs_data *dbs_data; |
426 | struct od_dbs_tuners *od_tuners; | |
44152cb8 | 427 | |
fb30809e JS |
428 | if (cpumask_test_cpu(cpu, &done)) |
429 | continue; | |
430 | ||
8c8f77fd | 431 | policy = cpufreq_cpu_get_raw(cpu); |
10dd8573 | 432 | if (!policy || policy->governor != &CPU_FREQ_GOV_ONDEMAND) |
8c8f77fd RW |
433 | continue; |
434 | ||
435 | policy_dbs = policy->governor_data; | |
e40e7b25 | 436 | if (!policy_dbs) |
c2837558 | 437 | continue; |
fb30809e JS |
438 | |
439 | cpumask_or(&done, &done, policy->cpus); | |
c2837558 | 440 | |
bc505475 | 441 | dbs_data = policy_dbs->dbs_data; |
c2837558 JS |
442 | od_tuners = dbs_data->tuners; |
443 | od_tuners->powersave_bias = default_powersave_bias; | |
fb30809e | 444 | } |
09681a07 | 445 | cpus_read_unlock(); |
fb30809e JS |
446 | } |
447 | ||
448 | void od_register_powersave_bias_handler(unsigned int (*f) | |
449 | (struct cpufreq_policy *, unsigned int, unsigned int), | |
450 | unsigned int powersave_bias) | |
451 | { | |
452 | od_ops.powersave_bias_target = f; | |
453 | od_set_powersave_bias(powersave_bias); | |
454 | } | |
455 | EXPORT_SYMBOL_GPL(od_register_powersave_bias_handler); | |
456 | ||
457 | void od_unregister_powersave_bias_handler(void) | |
458 | { | |
459 | od_ops.powersave_bias_target = generic_powersave_bias_target; | |
460 | od_set_powersave_bias(0); | |
461 | } | |
462 | EXPORT_SYMBOL_GPL(od_unregister_powersave_bias_handler); | |
463 | ||
ffac80e9 VP |
464 | MODULE_AUTHOR("Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>"); |
465 | MODULE_AUTHOR("Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>"); | |
466 | MODULE_DESCRIPTION("'cpufreq_ondemand' - A dynamic cpufreq governor for " | |
2b03f891 | 467 | "Low Latency Frequency Transition capable processors"); |
ffac80e9 | 468 | MODULE_LICENSE("GPL"); |
1da177e4 | 469 | |
6915719b | 470 | #ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND |
de1df26b RW |
471 | struct cpufreq_governor *cpufreq_default_governor(void) |
472 | { | |
10dd8573 | 473 | return &CPU_FREQ_GOV_ONDEMAND; |
de1df26b | 474 | } |
6915719b | 475 | #endif |
10dd8573 QP |
476 | |
477 | cpufreq_governor_init(CPU_FREQ_GOV_ONDEMAND); | |
478 | cpufreq_governor_exit(CPU_FREQ_GOV_ONDEMAND); |